/*******************************************************************************
 * Copyright 2011, 2012 Chris Banes.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package com.ezjie.ielts.view.photoview.gestures;

import android.annotation.TargetApi;
import android.content.Context;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;

@TargetApi(8)
public class FroyoGestureDetector extends EclairGestureDetector {

	protected final ScaleGestureDetector mDetector;

	public FroyoGestureDetector(Context context) {
		super(context);
		ScaleGestureDetector.OnScaleGestureListener mScaleListener = new ScaleGestureDetector.OnScaleGestureListener() {

			@Override
			public boolean onScale(ScaleGestureDetector detector) {
				float scaleFactor = detector.getScaleFactor();

				if (Float.isNaN(scaleFactor) || Float.isInfinite(scaleFactor))
					return false;

				mListener.onScale(scaleFactor, detector.getFocusX(),
						detector.getFocusY());
				return true;
			}

			@Override
			public boolean onScaleBegin(ScaleGestureDetector detector) {
				return true;
			}

			@Override
			public void onScaleEnd(ScaleGestureDetector detector) {
				// NO-OP
			}
		};
		mDetector = new ScaleGestureDetector(context, mScaleListener);
	}

	@Override
	public boolean isScaling() {
		return mDetector.isInProgress();
	}

	@Override
	public boolean onTouchEvent(MotionEvent ev) {
		mDetector.onTouchEvent(ev);
		return super.onTouchEvent(ev);
	}

}
